Main content area

Amorphous Flowerlike Goethite FeOOH Hierarchical Supraparticles: Superior Capability for Catalytic Hydrogenation of Nitroaromatics in Water

Ai, Yongjian, Liu, Lei, Zhang, Cheng, Qi, Li, He, Mengqi, Liang, Zhe, Sun, Hong-bin, Luo, Guoan, Liang, Qionglin
ACS applied materials & interfaces 2018 v.10 no.38 pp. 32180-32191
ambient temperature, catalysts, catalytic activity, energy, goethite, hydrogenation, hydrolysis, industry, iron, iron oxyhydroxides, nanomaterials, nitroaromatic compounds, p-nitrophenol, protocols, solvents
Fabrication of anilines from the corresponding nitroaromatics is a hot topic both for academia and for industry; however, conducting this protocol in water over a noble-metal-free catalytic system is still a great challenge. Continuous efforts are being made on exploiting novel catalysts for this transformation. In this work, we developed a scalable method for synthesizing the uniform flowerlike amorphous α-FeOOH hierarchical supraparticles. The well-defined amorphous α-FeOOH was prepared through an environmentally benign method, which is hydrolysis of the self-assembled iron glycolate at room temperature. Compared with other iron-only catalysts, this flowerlike amorphous α-FeOOH hierarchical supraparticle catalyst exhibits the best performance in the catalytic reduction of nitroaromatics to corresponding anilines by using water as the reaction solvent (turn over frequency is 106 h–¹ for 4-nitrophenol in water). The further results indicated that the amorphous structure, special nanostructures, and adsorption–desorption synergy offered excellent activity. The kinetics study shows that the reduction of 4-nitrophenol is first order for α-FeOOH, and the apparent active energy Eₐ is 75.9 kJ mol–¹. Furthermore, this catalyst can be used for eight times without obvious catalytic activity loss. We believe that this novel flowerlike amorphous α-FeOOH hierarchical supraparticle catalyst is a milestone in the reduction of nitro compounds.